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Q: One visitor asked, "I have recently had my red oak floors sanded and refinished. There are a few large spots that are dark and could not be sanded out. The biggest problem I had was in several areas the ends of the boards where they meet other boards turned out to be black.
Is this a natural effect of the wood? Any help would be appreciated. Thank you."

A: These black marks sound like "pet stains". The only practical way to deal with them is replace the boards.
Some boards in lower grade wood can have dark mineral streaks, but that is not what this sounds like in your case. On the ends of the boards, is this black mark confined to the joint or does it creep several inches, for example on the surface and away from the end?